What forms when one oceanic plate is forced beneath another plate?
a. an ocean basin
b. ocean ridges
c. a subduction zone
d. a rift valley

What forms when one oceanic plate is forced beneath another plate is C. a subduction zone.
The name itself can explain it all - the prefix sub- in Latin means 'under,' and given that beneath and under mean the same, subduction zone is the answer you should pick. The other options do not show such a relationship which is why they are wrong.

We are not able to see the stars. light prevents our seeing the stars. i hope it kinda : )